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【单选题】
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes? ()
A.
Their bearing is almost constant,even when the true bearing of the contact changes appreciably
B.
They always appear on a bearing of 90°From the true bearing of the contact
C.
The indirect echoes usually appear in shadow sectors
D.
When plotted,their movements are usually abnormal
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【单选题】From the first paragraph, we can deduce that ______.
A.
highly intelligent and strong, elephants are the largest land animals
B.
elephants are among the longest-lived, with life spans of 60 years or less
C.
healthy, full-grown elephants have natural enemies rather than humans
D.
human beings bring great harm to the elephants
【单选题】Passage Four Have you ever heard of a flower whose seeds are carried and spread by elephants? The rafflesia, a rare blossom, is very unusual. Found in the rain forests of Sumatra, the rafflesia is the...
A.
provide food for the giant flower
B.
water the rafflesia with their trunks
C.
carry rafflesia seeds from one place to another
D.
stomp out the awful smelling petals
【单选题】According to the passage, what is special about the expert's way of climbing onto an elephant?
A.
It is the easiest for the passenger.
B.
It is so elegant and yet quite simple.
C.
It is the most comfortable for the elephant.
D.
It can be carried out with a special command.
【单选题】吊顶工程骨架的起拱要求 。
A.
房间长向跨度的1~3‰
B.
房间短向跨度的1~3‰
C.
房间长向跨度的3~5‰
D.
房间短向跨度的3~5‰
【单选题】对颧突的描述,不正确的是
A.
为上颌第一前磨牙根尖部的骨突起
B.
表面覆盖的粘膜薄
C.
位于口腔前庭
D.
颧突的位置可接近牙槽嵴顶
【简答题】The orderly came back in a few minutes with a rifle(步枪)and some Burmans. He told us that the elephant was in the rice fields below, only a few hundred yards away. As I started forward practically the ...
【单选题】下列叙述中哪条与磺胺类药物不符
A.
苯环上的氨基与磺酰胺基必需处在对位
B.
苯环被其他环取代则抑菌作用消失
C.
N1的一个氢被杂环取代时有较好的疗效
D.
为二氢叶酸还原酶的抑制剂
E.
抑菌作用与化合物的pKa有密切关系
【单选题】Most of the elephants you see are Indian elephants. But sometimes you see an African elephant. You can easily tell the two apart by looking at their ears. African elephants have ears at least twice as...
A.
They live to the south of the Sahara.
B.
They can be divided into two species.
C.
They are all larger than Indian elephants.
D.
They have bigger ears than the Indian elephants.
【单选题】Where does most knowledge of Asian elephants come from?'
A.
From the captured or tamed elephants.
B.
From the British wildlife protection group.
C.
From elephant hunters in Thailand and Burma.
D.
From tourists visiting the Thai-Burmese border.
【简答题】句型转换。 1. He likes elephants because they are interesting (就画线部分提问) _______ _______ he _______ elephants? 2. She likes pandas best of all the animals. (变为同义句) _______ _______ _______ is pandas. 3. Tim ...
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