【判断题】双子叶植物的维管束一般为无限维管束,而单子叶植物为有限维管束。()
【判断题】自甘冒险原则的适用受到一定的限制,在自甘冒险者的行为符合救助或人道主义原则时,不得适用。
【简答题】孢蒴是孢子体最重要的结构,由 、 和 3部分组成。
【单选题】The primary purpose of this passage is to explain that ______.
A.
not all reports on food are scientifically sound
B.
it is important for the public to know the risks of pesticides
C.
vegetables and fruits can be harmful to children's health
D.
there should be no public concern over pesticides