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【单选题】
化学与人类生产和生活密切相关。下列说法不正确的是A.
苯酚有一定毒性，但它的稀溶液可直接用作消毒剂和防腐剂
B.
蛋白质、纤维素、蔗糖、PVC、淀粉都是高分子化合物 C. 油脂皂化生成的高级脂肪酸钠是肥皂的有效成分 D．改液化石油气为天然气作燃料，燃烧时应减小进空气量或增大进天然气量
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反馈参考答案：
举一反三
【单选题】“Please don’t forget ______ the door when you leave.” “No, I won’t forget ______ it.”
A.
to lock; to lock
B.
to lock; locking
C.
locking; to lock
D.
locking; locking
【简答题】历史曲线的数据来源是_____________。
【单选题】.()通过一个拥有与专用网络相同策的共享基础设施,提供对企业内部网或外部局域网的远程访问。
A.
Access VPN
B.
Intranet VPN
C.
Extranet VPN
D.
Internet VPN
【单选题】9) Why wouldn’t the car start if the driver returned to the carvery soon ? A) Because it had used its vapor lock. B) Because its vapor lock was too cold. C) Because its vapor lock hadn’t cooled down. ...
A.
Because it had used its vapor lock.
B.
Because its vapor lock was too cold.
C.
Because its vapor lock hadn’t cooled down.
D.
Because the car was tired from running.
【单选题】Don’t forget to lock the door , _____ ?
A.
do you
B.
don’t you
C.
will you
D.
won’t you
【单选题】— You didn't lock the back door. — You are wrong. I ______. [ ]
A.
have locked it
B.
lock it myself
C.
did lock it
D.
do lock it
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