1 . 从行为心理学分析，他奇怪的行为可能源于他最近的压力。(account)
From the perspective of behavioral psychology, ________________.

2 . Plenty of things can cause stress, and there are such things as good stress and bad stress. Good or normal stress _________ show up when you’re called on in class or when you have to give a report.

A．must

B．might

C．shall

D．would

3 . Handshaking ________ have started as an ancient custom to demonstrate to a stranger that you had no weapon in your hand. (用适当的词填空)

4 . A teacher ________ read 10,000 essays over a 40-year career. A machine can read millions of essays within minutes. We have no chance of competing against machines on frequent, high-volume tasks. (用适当的词填空)

5 . The slow growing lichen (地衣) and mushrooms upon which the reindeer depend for survival are not found in plantations. So, the death of one __________ mean the death of the other, and an uncertain future for an entire people. (用适当的词填空)

7 . This _____ sound crazy but I was on my way to drop some of my mother’s things off at the charity bins. (用适当的词填空)

8 . Many adults report that even when out in nature, they ________ not take the time to admire a spectacular mountain ________ pulling out their smartphone to take a picture.

A．may … before	B．may … after
C．should … before	D．should … after

10 . 人们假设，在宇宙中或许存在其他形式的生命，但他们不一定长得像人类。（......assumed）（汉译英）