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【简答题】
Match the words in bold with the definitions: At an art exhibition, a variety of paintings and drawings may be on display: for example, portraits, landscapes, and still lifes (note the plural here is lifes, not lives). Some artists work in oils (oil paints), while others use watercolours. Styles vary too: some works of art are 1 realistic , others are abstract. 2 Skilled artists use a range of 3 techniques to 4 create different 5 sorts of effects.
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举一反三
【单选题】听对话并回答问题。
A.
She is a patient listener and can understand complex ideas.
B.
She is easy to talk to and good at making complex ideas easy.
C.
She is well-known for being willing to help students.
D.
She has office hours on Wednesday at 11 a.m.
【单选题】2010年3月30日，我国研究人员发表报告认为，全球将有1.4亿人因为用水而受到砷中毒之害、导致更多的人患癌症。海带含砷超标，经水浸泡24小时后，其含砷量才能达到食用安全标准。下列对砷(As)的有关判断正确的是 （ ）
A.
砷原子序数为33，第4周期第5A族
B.
砷酸化学式为H 2 AsO 4
C.
砷化氢的稳定性比溴化氢的强
D.
砷酸的酸性比硫酸的弱
【单选题】听对话并回答问题。
A.
Because he failed the class once before.
B.
Because he once offended the professor.
C.
Because he is too shy and nervous.
D.
Because he is often called on by the professor in class.
【简答题】二进制数 1010111 与 1001011 的和是 __________ 。
【单选题】听对话并回答问题。
A.
He is worried whether he could pass the test.
B.
He hasn’t read the textbook.
C.
He has difficulties in writing an essay.
D.
He thinks there are too many concepts in the textbooks.
【简答题】下表列出前20号元素中的某些元素性质的一些数据 试回答下列问题： （1）已知H为Na元素,则以上10种元素中第一电离能最小的是__________（写元素符号）。比元素B原子序数大10的元素其基态原子的核外电子排布式是__________。 （2）元素E与C及氢元素可形成一种相对分子质量为60的一元羧酸分子。其一分子形成______个σ键，______个π键。 （3）短周期某主族元素K的电离能...
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