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【单选题】
膦(PH 3 )又称磷化氢,在常温下是一种无色、有大蒜臭味的有毒气体,电石气的杂质中常含有磷化氢。它的分子构型是三角锥形。则下列关于PH 3 的叙述正确的是 [     ]
A.
PH 3 分子中有未成键的孤对电子
B.
PH 3 是空间对称结构
C.
PH 3 是一种强氧化剂
D.
PH 3 分子中的P-H键间夹角是90°
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举一反三
【单选题】The sign means “ ”.
A.
No left turn. 
B.
Don’t turn left.  
C.
No right turn .
【简答题】W hat is machined suce quality ? How many aspects does it contain?
【单选题】The sigh “No left turn" tells us "()
A.
Don't turn left
B.
Turn left
C.
Go straight
D.
Turn right
【简答题】W hat is machining accuracy? W hat does Machining precision includ e ?
【单选题】__________ lovely presents they are!
A.
W hat
B.
W hat a
C.
How
D.
How a
【单选题】A : ______________________ ? B :我 9 岁。wǒ 9 suì
A.
你多大?nǐ duō dà
B.
你几岁?nǐ jǐ suì
C.
你多大年纪?nǐ duō dà niánjì
D.
你多少岁?nǐ duōshǎo suì ?
【简答题】First turn left on the corner and then turn right ______ the fountain. a. in b. on c. at d. for
【多选题】W hat is an essay?
A.
An organized piece of writing
B.
centers around a single topic
C.
the length may vary
【单选题】- _     _ _. -I want a white hat.
A.
How much is a hat?
B.
Can I help you?
C.
Do you have a hat?
D.
What do you want to buy?
【单选题】A:_________? ( )B:我9岁。 Wǒ suì.
A.
你多大? Nǐ duō dà?
B.
你几岁? Nǐ  jǐ  suì?
C.
你多大年纪? Nǐ duō dà niánji?
D.
你多少岁? Nǐ duōshǎo suì?
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