题目内容

It takes only a few seconds _______and buy something from an online store.

A. choose
B. chosen
C. choosing
D. to choose

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It makes the planet's atmosphere a little warmer by _______ CO2.

A. release
B. released
C. releasing
D. to release

Translate the underlined part in the sentence "That process also burns oil, contributes to traffic jams."

A. 投稿
B. 捐赠
C. 造成
D. 有助于

The _______ of the house will pay the deposit next week.

A. purchase
B. purchaser
C. chase
D. chaser

神经系统的发生均来源于（）

A. 外胚层
B. 中胚层
C. 内胚层