DNA is very useful for us, it many years ago. (1.0)
A. discovers
B. discovered
C. is discovered
D. was discovered
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- Do you know now?- Because we need to develop our life. (1.0)
A. why we have more new inventions
B. why we had more new inventions
C. why do we have more new inventions
D. why did we have more new inventions
Don’t touch that-it’s hot! (1.0)
A. 不要碰它,很凉!
B. 不要碰它,很烫!
C. 不要碰它,有毒!
I was drinking my coffee when I saw him. (1.0)
A. 当他看见我时我正在喝咖啡。
B. 当我看见他时他正在喝咖啡。
C. 当我看见他时我正在喝咖啡。
If you don’t listen, you don’t learn.(1.0)
A. 如果你不说,你就学不到东西。
B. 如果你不写,你就学不到东西。
C. 如果你不听,你就学不到东西。
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