It makes the planet's atmosphere a little warmer by _______ CO2.
A. release
B. released
C. releasing
D. to release
查看答案
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
神经管前神经孔闭合时间是（）
A. 25天
B. 27天
C. 30天
D. 42天
微信支付 
支付宝支付