题目内容

A car that only usesenergy and not fossil energy like petrol is very environmentally friendly.

A. sole
B. solar
C. only
D. rare

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We areimproving the state of the environment by reducing the level of CO2 we produced.

A. luckily
B. carefully
C. happily
D. gradually

We moved to Londonwe could visit our friends more often.

A. even if
B. lest
C. so that
D. in case

You see the lighteningit happens, but you hear the thunder later.

A. the instant
B. for an instant
C. on an instant
D. in an instant

We'll visit England and Germany next yearwe have enough money.

A. unless
B. lest
C. provided
D. until