[填空题]Those foods labeled simply "organic" must have at least ______ organic ingredients.

[填空题]Those companies who can sell stock must have the authorized permission of ______.

[填空题]The opinion that "Frankenstein foods" have had adverse health effects on consumers lacks enough ______.

[填空题]The products labeled "made with organic ingredients" must contain at least organic content ______.

[填空题]They must have also enjoyed themselves because they gave us the word "laughter".

[填空题]The audience must have missed their musical performance, or they ______ (会给予高度评价的).

[单项选择]There must have been someone who has instigated a rebellion because the people are so well organized.
A. incited
B. tampered
C. intruded
D. meddled

[单项选择]The child with rheumatic fever must have his heart rate measured while awake and while sleeping. Why are two readings necessary（）
A. To obtain a heart rate that isn’t affected by medication.
B. To eliminate interference from the jerky movements of chorea.
C. To ensure that the child can’t consciously raise or lower the heart rate.
D. To compensate for the effects of activity on the heart rate.

[判断题]In a partnership the general partner must have unlimited liability.

[单项选择]One must have studied hard before one could succeed in mastering a foreign language.（）
A. 在掌握一门外语之前只有刻苦学习。
B. 不下工夫是掌握不了外语的。
C. 谁肯下工夫，谁就能精通外语。
D. 必须勤学苦练，才能精通一门外语。

[单项选择]

Many tourists must have dreamed of owning a small house in a foreign country -- perhaps on a stretch of lonely coast -- to which they could return year after year to enjoy the sun and the sea. Others, with even bigger ideas and a lot more money to spend, think of buying hotels. In any case, it is absolutely essential to know a great deal about the value of property, otherwise the buyer may be at the mercy of(由……摆布) dishonest agents.
Some tourists, however, are so foolish that they really deserve to be cheated by agents. We would consider a person mad if he walked into a museum and asked to "buy" a great work of art. Though no one has told us, we all know that certain things can never be sold, no matter how much money is offered. Yet, nearly every year since 1944, a buyer has been found for the Colosseum (古罗马圆形剧场) in Rome. The first one was a soldier who parted with his money for what was described as "a rather broken down and heavily damaged b
A. indifferent
B. concerned
C. defensive
D. scornful