题目

科研人员测定了生活在南方和北方的两种植物叶片在不同温度下的光合作用强度，并分别与30°C时测定的数据比较，以其百分比为给坐标，温度为横坐标，结果如图所示，下列说法不正确的是                     （    ） A．温度超过40°C时A的氧气生成量减少 B．温度高于50°C时B不能生长 C．B是南方植物，A是北方植物 D．大约在47°时A不能积累有机物Let’s Explore (探索)The Nature!Are you interested in animals and nature? Want to enjoy your summer holiday and learn something interesting and useful?Here comes your chance! Youth Explore has prepared you with a THREE-DAY SUMMER PROGRAM! You can take part in many activities and meet with live animals, such as giraffes, pandas, tigers, and so on! More information about the program is as follows:Age: Students aged 8~16Groups: There are 2 programs for you to choose from. Each program needs at most 15 students.Program ADates: 14 ~ 16 July, 2014Days: Monday to WednesdayTime: 10:00 a.m. ~ 4:00 p.m.Program BDates: 5 ~ 7 August, 2014Days: Tuesday to ThursdayTime: 10:00 a.m. ~ 4:00 p.m.Program cost: $230 for members; $250 for non-membersHow to do: Simply come to our centre to get an application form. Send your completed form on or before 11th July, 2014 (Friday).Notes:1. No free lunches are provided because of personal food differences. You may either bring a lunch-box or pay for lunch at our restaurants.2. Both programs will start 1 day later if there is a warning of rainstorms.COME AND JOIN US NOW! DON’T MISS THE CHANCE!1. ________can join the three-day summer program.A. A kid of 7 B. A boy of 14C. A girl of 17 D. A man of 262.If there is a rainstorm on 14th July, program A will start on _________.A. Sunday B. MondayC. Tuesday D. Wednesday3.Two members and one non-member should pay ______ for the program.A. $690 B. $710 C. $730 D. $7504.Free lunches aren’t provided because ______.A. the lunches cost too muchB. people have different tastesC. there are many restaurantsD. they may bring lunch-boxes5.What can we know from the passage?A. Youth Explore is the name of the program. B. More than 15 students are in each program.C. We can see three kinds of animals in the program.D. You need to hand in an application form for the program.