皮皮学，免费搜题
登录
搜题
【单选题】
In the sentence 'Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants.', 'vulnerable' probably means ______.A.
defenseless
B.
protected
C.
strong
D.
fragile
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】In English, such expressions as “Excuse me”, “Pardon me” are adopted to attract people's attention.
A.
正确
B.
错误
【简答题】世界各地水域,在港湾、潮流、风向中、水深,以及地球球面距离等自然条件限制下,可以供船舶航行的一定路径是 。
【简答题】Complete the sentences with the collocations in Activity 1. 1. such as literacy and maths, are taught in the first years of primary school. 2.In the old days people were more likely to stay in their f...
【单选题】在单片机 C语言中用于结构化程序设计的三种基本结构是( )。
A.
顺序结构、选择结构、循环结构
B.
if、switch、break
C.
for、while、do-while
D.
if、else
相关题目：